Quote:
Originally Posted by bytor666
One word of caution: The DGM O-III isn`t as good as the DGM NPB. The DGM O-III is supposed to be rated at around 12 nanometers or so like other good O-III filters, but it falls short in performance, don`t know why, but it does. I think the bandpass is wider than a good O-III IIRC.
I compared two different DGM O-III filters to two diff Orion Ultrablock filters and the performance was the same on many targets that are supposed to have O-III and UHC-type filters used for optimal performance. The DGM O-III wasn't horrible, but it wasn't the greatest for an O-III either. The DGM NPB is excellent.
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Thanks for that feedback. Unfortunately, the filters have already been mailed so i'm committed to both.
At this stage, I have no idea
personally how filters are MEANT to look (never having looked through one before) so my decision has been based soley on feedback from forums like this one.
cheers
Jeelan